Improvement in molding



NITED STATES PATENT OrmesG JOHN DOUGHER-TY, OF COLD SPRING, NEW YORK.

IMPROVEMENT IN MOLDING.

Specification forming part of Letters Patent No. 28.260, dated May 15,1860.

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Be it known that I, J onN DOUGHERTY, of Gold Spring, iny the county ofPutnam and State of New York, have invented a new and Improved Machinefor Operating Templets in Loano-Molding; and l do hereby declare thatthe following is a full, clear. and exact description thereof, referencebeing had to the accompanying drawings, forming a part of thisspecification, in which- Figure l represents a side elevation of themachine.

Similar letters of reference indicate correspending parts in bothfigures.

This invention is an improvement in managing the templets that are usedin loam-molding for casting large work-such, for instance, assteam-cylinders, large pipes, ily-wheels, and such molds that cannot beconyteniently and accurately made in the ordinary method of molding.

The method of molding such work in loam is at present attended with manydifficulties familiar to those skilled in the art, which itis thespecial object of my invention to remedy.

For such work as steam-cylinders or wheels of large diameter the presentmode of casting them, as is well known, is by building up a mold ofbrick-work coated or plastered with soft loam, which is scraped forcylinders into the cylindrical form by a radius-board moved round on itsaxis. When the surface is thoroughly dry, it is brushed over withblackwash and again dried. A templetis now used,cut exactl y to theexternal form of the cylinder, which is attached to the axis at thedistance from the core required for the thickness of the metal. Someadditional loam is thrown in to form the thickness, which is smoothed inthe same careful manner as the center, after which the templet and itsspindle are dismounted. The base-ring for the outer case or cope is nowlaid down, and this outer case is built up of bricks and loam,with aninner facing of loam worked very accurately` to the turned thickness.The new work or the cope is also thor oughly dried, and afterward liftedoff very carefully by means of the crane and a crossbeam with fourAchains. The mold is now put together in a pit sunk in the floor of thefoundry, and the casting is performed in any of the well-known ways.

Fig. 2 is a plan view of the same.

My invention consists 4in a novel arrangement of gearing, combined withthe central spindle carrying the templet, for giving to said templet ortcmplets of any description, according to the kind of work, a verticalreciprocating motion or a vertical motion combined with a circularmotion, as will be hereinafter described and represented.

To enable others skilled in the art to fully understand my invention, lwill proceed to describe its construction and operation.

In the drawings, A represents the truck or base of the machine, uponwhich is erected a hollow shaft or spindle, B. having its lower bearingin a step-block, B', on the truck A, and its upper bearing in abracket-block, C, that projects from a horizontal frame, D, placed at asuitable height above the floor of the foundry. This hollow shaftcarrieson its upper end a groovedv spur-wheel, E, that is acted upon by aworm-wheel,hereinafter de scribed, for giving to it a circular motion.

G is a hollow screw-shaft that passes up centrally throughthe hollowshaft B and through the spur-wheel E, and carries a -small bevelgear-wheel, F, on the upper end. This bevel spur-wheel F is actuated byeither one or the other of the twin bevel spur-wheels H H', which giveto the screw-shaft a right or a left rotary motion as one or the otheris brought into gear with t-he wheel E. The wheels H H' are on ahorizontal shaft, J, and secured to this shaft by a key-tenen, a, sothat they may have a longitudinal play, and thus be brought alternatelyinto gear with the spur wheel E. The shaft J may be driven by hand orother convenient power.

On the end of shaft .Tis keyed a large spur wheel, K, which gives motionto a similar spur-wheel, K', that has its bearings in the end of aswinging iron, b, hung from the endv of shaft J. The pivot-bearing ofwheel K' is guided and steadied by a slotted guideplate, c, that issecured to the end of frame D. This wheel K' is intended to transmitmotion to the endless screw or worm-wheel shaft L by acting upon apinion-spur, L.

y On the hollow shaft or spindle B is placed templet-bloek, M, which isa circular flanged wheel with perforations drilled through the anges,that receive bolts for securing the radius-bar of a templet to it. Thisblock M is taken down in order to remove the molds, the

manner of doing which Will be understood by any mechanic.

'New from this description it will be understood that by attaching atemplet to the block M, of any suitable radius, it may be operated witha reciprocating motion up and down the shaft B by alternately engagingthe twin wheels of shaft J with the bevel-wheel E of the screw-shaft G,or both a reciprocating and circular motion may be given to thetemplet-block by bringing into gear With the -wheel the Worm-Wheel onshaft L, and with this latter motion spiral castings may be made.

By combining with this machine a earriage, that will have a horizontalmovement upon which the inold is built, oval or elli`ptical molds may bemade.

The manner of constructing the molds' in loam is precisely the same asthat of the present mode; but the facility of operating the tenipletsthat are secured in the block M is the distinguishing characteristic ofmy inveir tion and improvement.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

rPhe templet-bloek M, combined with a hollow shaft, B, and screw-shaftG, and operated substantially in the manner and for the purposes hereinset forth.

JOHN DOUGHERTY.

Vitnesses:

A. H. LADUE, SAMUEL XV. CoUoH.

